CN102777290A

CN102777290A - Vapor storage and vent valve assembly and vapor emission system employing same

Info

Publication number: CN102777290A
Application number: CN2012101647912A
Authority: CN
Inventors: V·K·米尔斯
Original assignee: Eaton Corp
Current assignee: Eaton Corp
Priority date: 2005-03-15
Filing date: 2006-03-15
Publication date: 2012-11-14
Also published as: US20060207575A1; CN1834441A; DE102006011758A1; KR20060100231A; JP2006258100A; US7201155B2; CA2539379A1

Abstract

The present invention relates to an integral vapor storage and vent valve assembly for use with a small engine fuel tank and a vapor emission system employing the same. A vapor vent/rollover valve and surrounding storage canister are disposed in a common housing for positioning inside a small engine fuel tank. In one embodiment described, the canister surrounds the vapor vent/rollover valve which may include a gravity pressure relief valve and a vacuum relief valve. In another embodiment, a pressure relief valve and adjacent storage canister are disposed in a common housing for positioning inside a small engine fuel tank.

Description

Steam stores and ventilation valve assembly and use the vapor discharge system of this assembly

The application is be on March 15th, 2006, denomination of invention the applying date for " steam store and the ventilation valve assembly and use the vapor discharge system of this assembly " the dividing an application of patent application No.200610057472.6.

Technical field

The integral type steam that the present invention relates to be used in combination with the mini engine fuel tank stores and ventilation valve assembly and the vapor discharge system that uses this assembly.

Background technique

This specification, accompanying drawing and claim relate to and are used for less than about 25 horsepowers (18.6kW) and are widely used in the fuel system of mini engine of the type of hand tractor, riding mower and portable power generation unit and other similar appliances.For compact and the widely-used air cooling engine of loss of weight, and motor is equipped with cowling in some applications in these are used.The motor that in above-mentioned and other similar application, adopts has the fuel tank near motor usually, and for simplicity, is arranged to fuel and under action of gravity, flows to engine and carburetor from fuel tank; But, adopted petrolift in some applications.

In the mini engine of mentioning in the above, fuel tank is formed with usually and is arranged on adapter or dismountable lid of the user on the filler pipe or the closure member that extends from this fuel tank; And, and often need the funnel that uses the user to provide usually through toppling over the completion fueling with hand from carry-case.Filler lid in these motors is typically provided with when being used for during engine running, extracting fuel and allows make-up air to get into the vent passages of fuel tank.

Require recently this mini engine is forbidden fuel vapor emission in atmosphere, therefore do not allow to adopt this open fuel tank to ventilate.Must seal whole fuel system to prevent that fuel fume escapes in the atmosphere during tail-off; And, also require the fuel fume that captures in the storage of fuels system and when engine running, it entered engine intake.Therefore, need to give the mini engine that does not have this requirement before this to add the fuel vapor emission system.This is for limited compact in space or be equipped with and especially be easy to generate problem for the air cooling engine of cowling.

Consider the very large batch process of mini engine and the simplicity and the versatility that are used for the less fuel tank of this motor; Require to provide simply, to be easy to installation and vapor emission control system cheaply, and this system does not need the engine fuel tank that designs again or recombinate for this mini engine.In addition, consider those especially motor the spatial limitation in the application of cowling is housed, also requiring with the mode that does not significantly increase fuel tank and motor volume is that mini engine provides the fuel vapor emission control system.

Summary of the invention

The solution of this specification, accompanying drawing and claim explanation the problems referred to above also provides integral type steam storage device and vapor vent valve/roll-over valve in a shared housing, this common housing can be arranged in the mini engine fuel tank and during engine running, connect the atmosphere suction port from the outside and to the steam of the engine and carburetor stream of removing contamination.This device that forms has the steam storage device of charcoal jar form, and this steam storage device can be filled with sorbent, and centers on the float chamber of the vapor vent valve/roll-over valve that can comprise pressure relief valve and antivoid valve.The apparatus structure that forms like this is compact and be configured such that easily at the fuel tank shaping and be easy to be installed in the mini engine fuel tank.

Description of drawings

Fig. 1 is the schematic representation of the exemplary embodiment that in the mini engine fuel tank system, adopts;

Fig. 2 is that the embodiment's of Fig. 1 integral type steam stores and the side view of vapor vent valve/roll-over valve assembly;

Fig. 3 is the sectional view of the assembly of Fig. 2;

Fig. 4 is the exploded view of the assembly of Fig. 2; And

Fig. 5 is another embodiment's a sectional view.

Embodiment

With reference to Fig. 1; The mini engine fuel system enerally designated 10 of one exemplary embodiment and comprise the fuel tank of enerally designated 12, this fuel tank can be through adopting any known means for example ultrasonic welding or hot plate welding engage upper half shells 11 around flange 14 and form with lower half shell 13.Fuel tank 12 has and passes its upper wall setting and the filler pipe through 18 sealings of the dismountable lid of user or closure member or take over 16, and said lid or Sealing 18 can be threaded over to be taken on 16.Fuel tank has the gravity type fuel feed pipe 20 that passes its lower wall setting and be connected to engine and carburetor 24 via pipeline 22.

Integral type vapor vent valve/tumble or roll-over valve and steam storage charcoal canister assembly enerally designated 26, and can before flange 14 engages, this assembly be connected to the inboard perhaps through being represented by dotted outline and supporting with the suitable supporting structure that reference character 28 is represented of upper casing 11 at last lower half shell.

Assembly 26 has the steam that is connected to outlet connection 32 via flexible pipe 30 outlet 42 of removing contamination, and outlet connection 32 passes that fuel-tank wall is extended and is connected to the suction port of engine and carburetor 24 via pipeline 34.Assembly 26 also is provided with the atmosphere joint 36 of removing contamination, and this joint 36 gets into assembly 26 via joint 40 and the atmosphere that during removing contamination, allows as mentioned below that flexible pipe 38 is connected to the wall setting of passing fuel tank 12.

With reference to Fig. 2, assembly 26 is shown in space that its periphery radially forms or hollow part 44, has the outlet connection of removing contamination 42.The flexible pipe 38 that assembly 26 also is shown among Fig. 2 is connected to the atmosphere ventilation joint 36 on it.

With reference to Fig. 3 and 4, show in detail integral type vapor vent valve/tilt valve and storage device assembly 26, wherein lower shell body 46 for example can be by the welded seal of spin welding, friction welding or hot plate welding realization through any suitable means.Steam storage area that the inside formation of lower shell body 46 and valve chamber or float chamber 52 are adjacent to be provided with or charcoal jar 50; And, in exemplary embodiment shown in Figure 3, except that the radial gap 44 that forms at the periphery of lower shell body 46, apotheca or charcoal jar 50 can have overall for annular structure and can center on float chamber 52.

Be formed with the passage 54 that makes chamber 50 and atmosphere in the atmosphere inlet union 36; Carry out said connection through suitable filtering material layer 56 in an illustrated embodiment.In the embodiments of figure 3, can be provided with the adsorption material barrel 60 of constructing in the apotheca 50 according to the in-profile of chamber 50.Found to use granular carbonaceous material satisfactory in the present invention as sorbent 60 such as granular charcoal.

On sorbent tube 60, be provided with a maintenance layer parts 62, and by being configured to utilize spring 66 to keep the parts 64 of sorbents to keep this maintenance layer parts 62.

In chamber 52, be provided with float 68, this float remains in the chamber 52 through spring 70 and the holder 72 that is fixed to the bottom of chamber 52.Float is provided with flexible valve element 74 in the top; When the fuel level in the float experience fuel tank raises; This flexible valve member abuts is sealed this valve seat on the valve seat 76 that is formed at steam vent passages 78 lower ends, wherein steam vent passages 78 upper wall that passes float chamber extends in the independent steam decontamination chamber 80 that forms below the lid 48 on for example being fixed by welding to lower shell body 46.Holder 72 has a plurality of its holes 73 on every side that are formed at so that allow liquid fuel to get into float chamber 52.In the wall of float chamber, be formed with additional port or hole 82 so that permission fuel and steam get into float chambers through space 44.

The upper end of vent passages 78 is formed with valve seat 84, and weighted valve or gravimetric response valve element 86 are resisted against on this valve seat.

If hope; Valve element 86 can form two parts; And unidirectional VVV Vacuum Vent Valve 88 can be set therein, allow to reflux to be used for when the pressure of the decontamination chamber or the passage 80 of removing contamination is lower than atmospheric pressure, closing the valve seat 90 that is formed at element 86 upper ends, thereby prevent that fuel tank from being damaged by pressure.

Decontamination chamber 80 is communicated to the outlet 94 of removing contamination through passage 92.The weight that should be understood that valve element 86 is chosen as and makes it be used as the pressure relief valve of the positive pressure that keeps very little in the chamber 52.

Passage 92 is connected with passages 94 in being formed at joint 42, and this joint 42 is connected to the suction port of Carburetor via flexible pipe 30, joint 32 and pipeline 34.Can understand with reference to Fig. 3, chamber 50 is connected with passage 92 and in the outlet 94 of removing contamination of covering 48 lower opening.

With reference to Fig. 5; The pressure relief valve of another embodiment's combination and storage device enerally designated 100 also have integrally formed housing 102; Be formed with steam chamber 104 in this housing, have the steam-gas inlet path 10 8 that is connected with chamber 104 in the joint 106 with steam-gas inlet joint 106.Be formed with in another joint 110 that steam is removed contamination or outlet passage 112.This housing also limits the apotheca 114 that is adjacent to be provided with air bells chamber 104 and is communicated with air bells chamber 104 through inner passage 116; And; Apotheca 114 also with away from the passage 112 of removing contamination, atmosphere vent passages 118 of being formed in another joint 120 is connected, and this joint 120 forms with for example fixing and be sealed to the closure member of apotheca 114 ends or cover 122 by the welding of ultrasonic welding or spin welding technology through any suitable means.

Housing 102 comprises and is set to be used for through any suitable means for example fastening piece, tackiness agent or be solder-connected to the inboard installation protuberance 123,124 of fuel-tank wall.

Passage 116 comprises the guide face 126 that is used in the chamber inlet's dispersion flows of 114.If hope, filtering material layer 128 can be set on guide face 126; And, can above the import in vent passages 118 inlet chambers 114 filtering material layer 130 be set in a similar manner.

Be provided with the pressure relief valve of enerally designated 132 in the chamber 104, this pressure relief valve comprises the valve element 134 on the valve base surface 136 that is positioned at the end, chamber that is formed at path 10 8.Valve element 134 is formed by the material such as metal; This material is chosen as and makes valve element 134 close the predetermined pressure that in path 10 8, reaches expectation as the gravimetric response element so that keep valve seat 136, thereby overcomes the gravity of element 134 and allow valve under desired pressure, to open.Valve element 134 is included in wherein the antivoid valve of the enerally designated 138 that forms, and is lower than the pressure of atmosphere in this antivoid valve response channel 108 and the chamber 104 and moves apart valve seat 140.It is afford redress air and prevent that fuel tank is damaged by pressure during motor extracts fuel of fuel tank that vacuum valve 138 can be operated so that allow steam from apotheca 114.Should be understood that vacuum valve comprises very light valve element, like baton round, this valve element of direct draught very little in chamber 104 is closed antivoid valve.

Therefore, the embodiment of Fig. 5 provides the replacement mode of execution of the assembly 26 of Fig. 1, and apotheca forms adjacent with pressure relief valve rather than centers on pressure relief valve.The embodiment of Fig. 5 also allows the roll-over valve of long-range installation float control, therefore for the installation in mini engine fuel tank and fuel system extra flexibility is provided.

Therefore; The embodiment that preceding text are described and illustrated provides vapor vent valve/tilt valve with the uniqueness that stores the steam apotheca and novel integrated component; This assembly can comprise sorbent and can be installed in easily in the fuel tank that is used for mini engine in common housing, and also for engine intake the stream of removing contamination is provided via the hose coupling connection of passing fuel-tank wall so that during engine running, receive the air of removing contamination.

Although exemplary embodiment has been described and shown to preceding text, it should be understood that those skilled in the art can make within the scope of the claims and revising and modification.

Claims

1. the integral type steam that is used in combination with the fuel tank that is used for mini engine stores the assembly of charcoal jar and vapor vent valve, comprising:

Limit the shell construction of float chamber and vapor outlet port; With

Be arranged in the said float chamber and when reaching removable to open the pressure relief valve of said vapor outlet port when being scheduled to vapor tension in the said float chamber;

Wherein, said shell construction also limits the steam apotheca with the steam channel that is connected with said vapor outlet port.

2. assembly according to claim 1 is characterized in that, said steam apotheca comprises the steam sorbing material.

3. assembly according to claim 1 is characterized in that, also comprises being arranged in the said float chamber and when said assembly is tumbled, stoping the flow through float controlled valve of said vapor outlet port of fluid.

4. assembly according to claim 1; It is characterized in that said pressure relief valve comprises the antivoid valve that when the vapor tension in the said float chamber is lower than the vapor tension in the said vapor outlet port, allows the steam from said vapor outlet port to said float chamber to reflux.

5. assembly according to claim 4 is characterized in that, said antivoid valve is arranged in the movable valve member in the said pressure relief valve.

6. assembly according to claim 1 is characterized in that, said steam apotheca has overall for the profile of annular and around said float chamber.

7. fuel vapor emission system that is used for the fuel tank of mini engine comprises:

Fuel tank near the mini engine setting;

The tube equipment of the liquid fuel circulation path of qualification from the fuel tank to the mini engine; And

Be arranged in the fuel tank and be connected to engine intake like each described assembly among the claim 1-6.